The net income earned from investments in securities and other investments including derivatives. It includes dividends from shares in corporations, and interest from bonds, loans, mortgages, derivatives, commercial paper, bank accounts, certificates of deposits, treasuries, and other financial securities. It also includes realized and unrealized gains and losses on all investments.

No definition available.

Supplemental guarantor information - Consolidated Statement of Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										9 Months Ended		12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Gross premiums written	$ 126,403us-gaap_AssumedPremiumsWritten	$ 162,277us-gaap_AssumedPremiumsWritten	$ 45,425us-gaap_AssumedPremiumsWritten	$ 98,215us-gaap_AssumedPremiumsWritten	$ 96,020us-gaap_AssumedPremiumsWritten	$ 27,895us-gaap_AssumedPremiumsWritten	$ 41,651us-gaap_AssumedPremiumsWritten	$ 28,178us-gaap_AssumedPremiumsWritten	$ 92,650us-gaap_AssumedPremiumsWritten	$ 0us-gaap_AssumedPremiumsWritten	$ 359,498us-gaap_AssumedPremiumsWritten	$ 239,660us-gaap_AssumedPremiumsWritten	$ 401,937us-gaap_AssumedPremiumsWritten	$ 190,374us-gaap_AssumedPremiumsWritten	$ 0us-gaap_AssumedPremiumsWritten
Gross premiums ceded	(150)us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	(9,975)us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	(150)us-gaap_CededPremiumsWritten	(9,975)us-gaap_CededPremiumsWritten	(9,975)us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten
Net premiums written	126,253us-gaap_PremiumsWrittenNet	162,277us-gaap_PremiumsWrittenNet	45,425us-gaap_PremiumsWrittenNet	98,215us-gaap_PremiumsWrittenNet	86,045us-gaap_PremiumsWrittenNet	27,895us-gaap_PremiumsWrittenNet	41,651us-gaap_PremiumsWrittenNet	28,178us-gaap_PremiumsWrittenNet	92,650us-gaap_PremiumsWrittenNet	0us-gaap_PremiumsWrittenNet	359,348us-gaap_PremiumsWrittenNet	229,685us-gaap_PremiumsWrittenNet	391,962us-gaap_PremiumsWrittenNet	190,374us-gaap_PremiumsWrittenNet	0us-gaap_PremiumsWrittenNet
Change in net unearned premium reserves	(17,305)	(103,767)	20,904	(35,928)	(52,504)	5,590	(7,333)	(13,337)	(78,813)	0	(98,388)	(67,528)	(171,295)	(93,893)	0
Net premiums earned	108,948us-gaap_PremiumsEarnedNet	58,510us-gaap_PremiumsEarnedNet	66,329us-gaap_PremiumsEarnedNet	62,287us-gaap_PremiumsEarnedNet	33,541us-gaap_PremiumsEarnedNet	33,485us-gaap_PremiumsEarnedNet	34,318us-gaap_PremiumsEarnedNet	14,841us-gaap_PremiumsEarnedNet	13,837us-gaap_PremiumsEarnedNet	0us-gaap_PremiumsEarnedNet	260,960us-gaap_PremiumsEarnedNet	162,157us-gaap_PremiumsEarnedNet	220,667us-gaap_PremiumsEarnedNet	96,481us-gaap_PremiumsEarnedNet	0us-gaap_PremiumsEarnedNet
Net investment income	1,552tpre_InvestmentIncome		54,617tpre_InvestmentIncome			72,511tpre_InvestmentIncome	47,686tpre_InvestmentIncome	(17,623)tpre_InvestmentIncome	33,848tpre_InvestmentIncome	0tpre_InvestmentIncome	92,072tpre_InvestmentIncome	168,804tpre_InvestmentIncome	253,203tpre_InvestmentIncome	136,422tpre_InvestmentIncome	0tpre_InvestmentIncome
Equity in earnings of subsidiaries	0		0								0	0	0	0	0
Total revenues	110,500us-gaap_Revenues		120,946us-gaap_Revenues			105,996us-gaap_Revenues	82,004us-gaap_Revenues	(2,782)us-gaap_Revenues	47,685us-gaap_Revenues	0us-gaap_Revenues	353,032us-gaap_Revenues	330,961us-gaap_Revenues	473,870us-gaap_Revenues	232,903us-gaap_Revenues	0us-gaap_Revenues
Expenses
Other underwriting income															0us-gaap_OtherUnderwritingExpense
Loss and loss adjustment expenses incurred, net	60,115	36,133	39,349	45,692	18,638	26,626	24,709	16,686	12,285	0	150,783	103,679	139,812	80,306	0
Acquisition costs, net	38,317	18,833	21,117	14,921	13,073	10,898	10,856	2,138	712	0	93,331	49,111	67,944	24,604	0
General and administrative expenses	10,124us-gaap_GeneralAndAdministrativeExpense	8,965us-gaap_GeneralAndAdministrativeExpense	9,846us-gaap_GeneralAndAdministrativeExpense	7,217us-gaap_GeneralAndAdministrativeExpense	7,008us-gaap_GeneralAndAdministrativeExpense	7,155us-gaap_GeneralAndAdministrativeExpense	6,440us-gaap_GeneralAndAdministrativeExpense	9,621us-gaap_GeneralAndAdministrativeExpense	4,160us-gaap_GeneralAndAdministrativeExpense	1,130us-gaap_GeneralAndAdministrativeExpense	29,698us-gaap_GeneralAndAdministrativeExpense	24,071us-gaap_GeneralAndAdministrativeExpense	33,036us-gaap_GeneralAndAdministrativeExpense	27,376us-gaap_GeneralAndAdministrativeExpense	1,130us-gaap_GeneralAndAdministrativeExpense
Other expenses	2,982us-gaap_OtherExpenses		1,246us-gaap_OtherExpenses								4,789us-gaap_OtherExpenses	2,675us-gaap_OtherExpenses
Total expenses	111,538us-gaap_BenefitsLossesAndExpenses		71,558us-gaap_BenefitsLossesAndExpenses			44,679us-gaap_BenefitsLossesAndExpenses	42,005us-gaap_BenefitsLossesAndExpenses	28,445us-gaap_BenefitsLossesAndExpenses	17,157us-gaap_BenefitsLossesAndExpenses	1,130us-gaap_BenefitsLossesAndExpenses	278,601us-gaap_BenefitsLossesAndExpenses	179,536us-gaap_BenefitsLossesAndExpenses	240,792us-gaap_BenefitsLossesAndExpenses	132,286us-gaap_BenefitsLossesAndExpenses	1,130us-gaap_BenefitsLossesAndExpenses
Income (loss) before income tax expense	(1,038)		49,388								74,431	151,425
Income tax expense	(1,542)us-gaap_IncomeTaxExpenseBenefit		0us-gaap_IncomeTaxExpenseBenefit								(3,917)us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit
Income attributable to non-controlling interests	(2,580)us-gaap_ProfitLoss	81,653us-gaap_ProfitLoss	49,388us-gaap_ProfitLoss	26,524us-gaap_ProfitLoss	75,513us-gaap_ProfitLoss	61,317us-gaap_ProfitLoss	39,999us-gaap_ProfitLoss	(31,227)us-gaap_ProfitLoss	30,528us-gaap_ProfitLoss	(1,130)us-gaap_ProfitLoss	70,514us-gaap_ProfitLoss	151,425us-gaap_ProfitLoss	233,078us-gaap_ProfitLoss	100,617us-gaap_ProfitLoss	(1,130)us-gaap_ProfitLoss
Income attributable to non-controlling interests	(3,417)	(1,565)	(2,818)	(301)	(1,083)	(607)	(423)	120	(306)	0	(5,440)	(4,202)	(5,767)	(1,216)	0
Net income (loss)	(5,997)us-gaap_NetIncomeLoss	80,088us-gaap_NetIncomeLoss	46,570us-gaap_NetIncomeLoss	26,223us-gaap_NetIncomeLoss	74,430us-gaap_NetIncomeLoss	60,710us-gaap_NetIncomeLoss	39,576us-gaap_NetIncomeLoss	(31,107)us-gaap_NetIncomeLoss	30,222us-gaap_NetIncomeLoss	(1,130)us-gaap_NetIncomeLoss	65,074us-gaap_NetIncomeLoss	147,223us-gaap_NetIncomeLoss	227,311us-gaap_NetIncomeLoss	99,401us-gaap_NetIncomeLoss	(1,130)us-gaap_NetIncomeLoss
Parent Guarantor
Revenues
Total revenues										(1,092)			228,646	101,346
Expenses
General and administrative expenses										38			1,335	1,945
Total expenses										38			1,335	1,945
Net income (loss)										(1,130)			227,311	99,401
Reportable Legal Entities \| Parent Guarantor
Revenues
Gross premiums written	0		0								0	0	0	0	0
Gross premiums ceded	0		0								0	0	0	0	0
Net premiums written	0		0								0	0	0	0	0
Change in net unearned premium reserves	0		0								0	0	0	0	0
Net premiums earned	0		0								0	0	0	0	0
Net investment income	0		0								0	0	0	0	0
Equity in earnings of subsidiaries	(4,070)		46,849								69,224	147,618	228,646	101,346	(1,092)
Total revenues	(4,070)		46,849								69,224	147,618	228,646	101,346	(1,092)
Expenses
Other underwriting income															0
Loss and loss adjustment expenses incurred, net	0		0								0	0	0	0	0
Acquisition costs, net	0		0								0	0	0	0	0
General and administrative expenses	1,927		279								4,150	395	1,335	1,945	38
Other expenses	0		0								0	0
Total expenses	1,927		279								4,150	395	1,335	1,945	38
Income (loss) before income tax expense	(5,997)		46,570								65,074	147,223
Income tax expense	0		0								0	0
Income attributable to non-controlling interests	(5,997)		46,570								65,074	147,223	227,311	99,401	(1,130)
Income attributable to non-controlling interests	0		0								0	0	0	0	0
Net income (loss)	(5,997)		46,570								65,074	147,223	227,311	99,401	(1,130)
Reportable Legal Entities \| Issuer of Debt
Revenues
Gross premiums written	0		0								0	0	0	0	0
Gross premiums ceded	0		0								0	0	0	0	0
Net premiums written	0		0								0	0	0	0	0
Change in net unearned premium reserves	0		0								0	0	0	0	0
Net premiums earned	0		0								0	0	0	0	0
Net investment income	0		0								0	0	0	0	0
Equity in earnings of subsidiaries	0		0								0	0	0	0	0
Total revenues	0		0								0	0	0	0	0
Expenses
Other underwriting income															0
Loss and loss adjustment expenses incurred, net	0		0								0	0	0	0	0
Acquisition costs, net	0		0								0	0	0	0	0
General and administrative expenses	0		0								0	0	0	0	0
Other expenses	0		0								0	0
Total expenses	0		0								0	0	0	0	0
Income (loss) before income tax expense	0		0								0	0
Income tax expense	0		0								0	0
Income attributable to non-controlling interests	0		0								0	0	0	0	0
Income attributable to non-controlling interests	0		0								0	0	0	0	0
Net income (loss)	0		0								0	0	0	0	0
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Revenues
Gross premiums written	126,403		45,425								359,498	239,660	401,937	190,374	0
Gross premiums ceded	(150)		0								(150)	(9,975)	(9,975)	0	0
Net premiums written	126,253		45,425								359,348	229,685	391,962	190,374	0
Change in net unearned premium reserves	(17,305)		20,904								(98,388)	(67,528)	(171,295)	(93,893)	0
Net premiums earned	108,948		66,329								260,960	162,157	220,667	96,481	0
Net investment income	1,552		54,617								92,072	168,804	253,203	136,422	0
Equity in earnings of subsidiaries	0		0								0	0	0	0	0
Total revenues	110,500		120,946								353,032	330,961	473,870	232,903	0
Expenses
Other underwriting income															0
Loss and loss adjustment expenses incurred, net	60,115		39,349								150,783	103,679	139,812	80,306	0
Acquisition costs, net	38,317		21,117								93,331	49,111	67,944	24,604	0
General and administrative expenses	8,197		9,567								25,548	23,676	31,701	25,431	1,092
Other expenses	2,982		1,246								4,789	2,675
Total expenses	109,611		71,279								274,451	179,141	239,457	130,341	1,092
Income (loss) before income tax expense	889		49,667								78,581	151,820
Income tax expense	(1,542)		0								(3,917)	0
Income attributable to non-controlling interests	(653)		49,667								74,664	151,820	234,413	102,562	(1,092)
Income attributable to non-controlling interests	(3,417)		(2,818)								(5,440)	(4,202)	(5,767)	(1,216)	0
Net income (loss)	(4,070)		46,849								69,224	147,618	228,646	101,346	(1,092)
Eliminations
Revenues
Gross premiums written	0		0								0	0	0	0	0
Gross premiums ceded	0		0								0	0	0	0	0
Net premiums written	0		0								0	0	0	0	0
Change in net unearned premium reserves	0		0								0	0	0	0	0
Net premiums earned	0		0								0	0	0	0	0
Net investment income	0		0								0	0	0	0	0
Equity in earnings of subsidiaries	4,070		(46,849)								(69,224)	(147,618)	(228,646)	(101,346)	1,092
Total revenues	4,070		(46,849)								(69,224)	(147,618)	(228,646)	(101,346)	1,092
Expenses
Other underwriting income															0
Loss and loss adjustment expenses incurred, net	0		0								0	0	0	0	0
Acquisition costs, net	0		0								0	0	0	0	0
General and administrative expenses	0		0								0	0	0	0	0
Other expenses	0		0								0	0
Total expenses	0		0								0	0	0	0	0
Income (loss) before income tax expense	4,070		(46,849)								(69,224)	(147,618)
Income tax expense	0		0								0	0
Income attributable to non-controlling interests	4,070		(46,849)								(69,224)	(147,618)	(228,646)	(101,346)	1,092
Income attributable to non-controlling interests	0		0								0	0	0	0	0
Net income (loss)	$ 4,070		$ (46,849)								$ (69,224)	$ (147,618)	$ (228,646)	$ (101,346)	$ 1,092